[ckan-dev] GIS dataset import

Thu Jan 16 11:57:42 UTC 2014

Yes, capturing the thumbnails would be done server side. I guess we
might be able to use a headless browser like PhantomJS to capture the
image.

CKAN 2.2 has a convenient FileStore where the images can be kept.
http://docs.ckan.org/en/latest/filestore.html

Anyway, I've added it to the Trello and people can show interest or
not. Ideally this will motivate someone to implement it (or fund it).
https://trello.com/b/MkqvtXnH/ckan-community-development-ideas-requests-roadmaps

David

On 16 January 2014 11:34, Philippe Duchesne <philippe at okfn.be> wrote:
> thank you David.
>
> yes, thumbnail generation is something i have thought about.
> Ideally i would consider it as part of the harvesting process, thus running
> server side.
> However it is probably easier to first do that browser-side, and leverage
> the existing openlayers-based viewer. But it would then be a manual
> operation.
> Is there a generic support for thumbnails generation/storage/display in CKAN
> ? (geo stuff put aside)
>
> To be exact, there is currently no OL3 support, as OL3 has not yet protocol
> implementations for OGC services. So it's currently all OL2.
>
> FYI, one more simple but convenient feature : the CKAN resource url supports
> the BBOX fragment to directly point the viewer at a given bounding box:
> http://portal.openbelgium.be/dataset/geospatial-test/resource/f1b701a2-a3f3-46b5-9947-ebcc6bb806cc#bbox=4.3837,50.8426,4.3884,50.8446
>
> I'll share further developments.
>
> best,
>
> --p.
>
>
>
> On Thu, Jan 16, 2014 at 12:00 PM, David Read
> <david.read at hackneyworkshop.com> wrote:
>>
>> Philippe,
>>
>> This is spectacular! A previewer for geo-data in nearly any format!
>>
>> A glance at the code suggests you've done an extensive job on this,
>> with a proxy that chunks and OpenLayers 2 and 3 support. So once
>> you've ironed out the remaining issues, I'm sure everyone will be
>> pleased to benefit from it and encourage more geo-data publishing.
>>
>> One idea that I'm keen on is creating thumbnail images of these
>> previews, that could be shown on the resource or even dataset page. I
>> think this would entice people to the previews. Is there some JS or
>> OpenLayers function that could create a mini screenshot to create the
>> thumbnail automatically that we might employ at some point?
>>
>> David
>>
>> On 14 January 2014 21:36, Philippe Duchesne <philippe at okfn.be> wrote:
>> > Hello David, Cliff,
>> >
>> > FYI, a fork of ckanext-spatial done for openbelgium.be has support for
>> > WFS,WMS,KML,GML,GeoJSON,ArcGIS and Google Fusion Tables.
>> >
>> > You can have a look at
>> > http://portal.openbelgium.be/dataset/geospatial-test
>> > for a demo.
>> >
>> > The code is still in beta stage, but available at
>> > https://github.com/pduchesne/ckanext-spatial/tree/OL3_VIEWER
>> >
>> > best,
>> >
>> > --p.
>> >
>> >
>> > On Tue, Jan 14, 2014 at 5:52 PM, David Read
>> > <david.read at hackneyworkshop.com>
>> > wrote:
>> >>
>> >> Cliff,
>> >>
>> >> CKAN's datastore can store GIS data files like any others. The service
>> >> you then want to provide is the ability to preview them.
>> >>
>> >> data.gov has a previewer that I think should cover KML, and I don't
>> >> think it would be too hard to develop it to show GeoJSON and
>> >> Shapefiles too (since I believe OpenLayers supports these). Perhaps
>> >> OKF people can find a dataset as an example, because I couldn't find a
>> >> KML file with a quick look.
>> >>
>> >> The other way geodata is often provided is via a WMS or WFS server
>> >> (rather than as a downloadable file). CKAN is not ideal for serving
>> >> this data. But data.gov.uk has developed a WMS viewer for CKAN and it
>> >> is easily extended to WFS. I believe OKF has recently done a similar
>> >> tool.
>> >>
>> >> David
>> >>
>> >> On 13 January 2014 18:22, Cliff Ingham <inghamn at bloomington.in.gov>
>> >> wrote:
>> >> > We're looking at publishing all of the GIS data for our city.  Am I
>> >> > correct in thinking that CKAN is built for this, or is CKAN only for
>> >> > the
>> >> > metadata about our GIS data?
>> >> >
>> >> > Importing GIS data files as datasets has not been going very well.
>> >> > I'm
>> >> > thinking we're doing it wrong.
>> >> >
>> >> > --
>> >> > Cliff Ingham
>> >> > http://www.ohloh.net/accounts/inghamn
>> >> > -------------------------------------
>> >> > "If debugging is the process of removing software bugs, then
>> >> > programming
>> >> > must be the process of putting them in."
>> >> > -- Edsger Dijkstra
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